Not to mention, if you're really local, you can beat out the competition in freshness and probably delivery costs as well (beyond a certain critical threshold of local customers at least). It's the resurgence of the milkman.
Taken one step further with the farm-to-table concept, I can see suburban delivery of local meal kits directly from nearby farms on a subscription basis. It becomes a value-add on the CSA concept.
In my area we have a pretty big concentration of high-income earners in relatively close proximity to small farms. It could probably be made to work in a situation like that.